Green Tea

Green tea is full of theanine, an antioxidant which acts as a calming agent. A Japanese study, conducted with more than 40,000 people, found that levels of psychological stress were 20% lower in people who drank five or more cups of green tea per day compared to those who drank less than one. The results held true even after other factors were accounted for, including age, sex, medical history, body mass index, alcohol consumption, cigarette smoking, and diet. Reach for green tea as a beverage, or incorporate loose tea leaves or brewed green tea into cooking.